I wouldnt keep shifting the transmission without fixing that clutch pedal u will damage the transmission. If the clutch pedal has no pressure then usually the slave cylinder leaks fluid look under ur car around the big part or ur transmission where it meets the engine. See if fluid is dripping from there or was dripping from there. Also sometimes after the slave goes out it takes out the clutch master but u wont know if it did take it out untill u try to bleed the system. Start there and let me know what u find.